Muffler or exhaust device for marine motors.



No. 890,014. PATENTED JUNE 9, 1908.

A. BARBOUR.

MUFFLER OR EXHAUST DEVICE FOR MARINE MOTORS.

APPLICATION FILED JULY 25. 1906.

'lil, :il f l v I 5 N I JEEP \E v x I P w w 5 O L UNITED STATES PATENTOFFICE.

ALVAH BARBOUB, OF SWANS ISLAND, MAINE.

MUFFLER OR EXHAUST DEVICE FOR MARINE MOTORS.

To all whom it may concern:

Be it known that I, ALVAH BARBOUR, a citizen of the United States,residing at Swans Island, in the county of Hancock and State of Maine,have invented certain new V and useful Improvements in Mufflers orExhaust Devices for Marine Motors and I do declare the following to be afull, clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

This invention relates, generally, to exhaust mufiiers and particularlyto mufflers for the exhaust of marine engines of the explosive type usedfor the propulsion of launches and other vessels and it has for itsobject to provide a simple, durable, and comparatively inexpensivemufller adapted to be submerged and to exhaust the products ofcombustion and explosion under water, and thereby obviate thedisagreeable noise and odor accompanying the exhaust in the atmosphere,and it consists in the parts and combinations of parts hereinafterdescribed and claimed.

In the accompanying drawings, forming a part of this specification,Figure 1 is a side elevation, partly broken away, of a boat showing myinvention in position thereon. Fig. 2 is an enlarged detail perspectiveview of the exhaust nozzle.

Similar letters refer to similar parts in both the views.

Referring to the drawings A represents a boat or vessel and B a motor orengine, preferably, of an internal combustion or explosive type,suitably arranged therein.

0 represents the flooring of the boat or vessel and D the keel thereof.

E is a rudder post and F the rudder both of which, as well as thepropeller G mounted on the shaft H, may be of any preferred style ortype and arranged in any preferred or suitable manner.

':l[he water line is indicated in broken lines at The exhaust pipe J isconnected to the ex haust port in any preferred or suitable manner andleads thence, in this particular instance, on an inclined line, as at a,to a point below the flooring C and is then carried on a horizontalline, as at 1), toward the stern, and is then turned vertically upward,as at c, to a point above the water line I. The exhaust pipe is thenturned at right angles toward the stern, as at d, and then vertically down- Specification of Letters Patent.

Application filed July 26, 1906.

Patented June 9, 1908.

Serial No. 327,902.

ward, as at e, and is connected to the exhaust nozzle L.

At a point in the exhaust pipe J above the water line and preferably insection 0, a discharge pipe M is placed with a three-way cock N, so thatthe exhaust gases may be directed towards the exhaust muffler, ordirectly to the atmosphere, at will.

The arrangement and position of the exhaust pipe above described ispractical and gives good results in o eration, but it may be arrangeddifferently if desired or found more convenient so to do the onlyessential being that at some point within the hull before it turns to gooutboard it stands above the wa ter line of the boat.

The exhaust nozzle L is connected in any desired or suitable manner tothe end of the exhaust pipe and as shown it is screwed thereinto andthen secured to the boat through the disk P, so as to insure a watertight joint, but it may be fastened to the boat in any other suitablemanner.

The body portion f of the nozzle L is conical in shape and its smallerend is bent vertically and tapers to a diameter corresponding,approximately, to the diameter of the exhaust pipe J.

The nozzle P may be attached to the bottom of the boat or on one sidethereof, or extend out through the run or stern of the boat the onlyessential being that it shall be firmly secured to the boat at theforward end and that the remainder of the conical nozzle shall standclear of the boat so as not to impart to the hull the blow of vibrationwhich is so noticeable where the discharge end of the nozzle is incontact with the hull.

I prefer that it be arranged under the run so that it shall be justunder water or submerged when the boat is at anchor and unoccupied, andthat the rearward end be entirely separate from the hull.

In operation the passage of the boat through the water creates a suctionat the mouth of the nozzle and exhausts the water causing a partialvacuum in the exhaust pipe which draws the gases and products ofcombustion and discharges the same under the water. When the boat orvessel is anchored or when it is to wing a load sufficient to retard thespeed of the same, the valve N is opened to permit of the exhaust to theatmosphere.

Having thus described my invention what I claim as new and desire tosecure by Letters Patent is: e H

1. A nozzle for the exhaust pipe of motor boats, having one end adaptedto connect with said exhaust pipe and the other end terminating with aconical, outwardly flaring and rearwardly discharging mouth piece submerged below the water-line and with its axis approximately parallel tothe same.

2. An exhaust mufi'ler for motor boats, com rising an exhaust pipe and.a conical nozz e said nozzle being connected at its forward, smaller endto said exhaust pipe, and said nozzle standing clear of the hull andbeing submerged below the water-line and approximately parallel to it.

3. An exhaust muflier for motor boats, comprising a pipe connected atone end to the exhaust orilice of the motor and at the other endterminating outside the hull near the stern and connected to the small,forward end of a submerged conical, outwardly and rearwardly dischargingnozzle in contact at one end only with the hull, and whose axis isapproximately parallel to the water-line.

i. A combination of an exhaust pipe connecting with the exhaust orificeof a marine motor, of a relief Valve at a point in said pipe above thewater-line, for the purpose of discharging all or a part of the gases tothe atmosphere, and a submerged, rearwardly-discharging conical nozzleconnected. to the ox 30 tremity of the said exhaust pipe and standingclear of the hull, said exhaust nozzle being submerged below thewater-line with its axis approximately parallel to it.

in testimony whereof, I alIix my signature, in presence of twowitnesses.

ALVAH BARB OUR. \Vitnesses C. M. WALKER, E. M. MAnsrI.

